Today was an ordinary day:
Parked my car with valet at bank (no other option). Tipped.
Parked my car with valet at dept store (no other option). Tipped.
Bought groceries at local supermarket. Boxboy helped me (I have bad shoulder so appreciated loading into my car). Tipped.
I tip for various and sundry things on a daily basis. I am happy to tip a skycap for helping lift large bags and make my departure easier.